<PackageReference Include="System.Security.Permissions" Version="10.0.0-preview.5.25277.114" />

DnsPermission

Controls rights to access Domain Name System (DNS) servers on the network.
using System.Security; using System.Security.Permissions; namespace System.Net { public sealed class DnsPermission : CodeAccessPermission, IUnrestrictedPermission { public DnsPermission(PermissionState state) { } public override IPermission Copy() { return null; } public override void FromXml(SecurityElement securityElement) { } public override IPermission Intersect(IPermission target) { return null; } public override bool IsSubsetOf(IPermission target) { return false; } public bool IsUnrestricted() { return false; } public override SecurityElement ToXml() { return null; } public override IPermission Union(IPermission target) { return null; } } }